Revert "Add hook to allow addons to filter the list returned by app_list"
This reverts commit a0cf2b53. Cxref: https://project.hubzilla.org/channel/hubzilla/&mid=04d2f42c4b452ddb62c00c3ee1ae112101b977a8e8b4228cb5f057953d22d651@project.hubzilla.org&owt=023e65804200894364921aeb04bcb422
From Mike: "You're doing it wrong." --- of course he's right... LOL At least he's nicer about it than Linus probably would have been.